Abstract
Excoecaria agallocha is one of the predominant mangrove species in the Indo-West Pacific (IWP) region with an extensive range of distribution. To infer the current geographical patterns of genetic variation and provide new insights on the historical population dynamics of mangrove species in the IWP region, we sampled E. agallocha across its distribution range and investigated the phylogeography of this species using four chloroplast DNA (cpDNA) fragments. Our results showed that E. agallocha possessed a high degree of species-level genetic diversity, while the average genetic diversity within populations was much lower. The presence of population genetic structure was supported by the estimates of genetic differentiation and the analysis of molecular variance (AMOVA). Of the ten haplotypes identified, no haplotypes were shared between the East Indian Ocean (EIO), the West Pacific Ocean (WPO), and the North Australian (NA) regions. Genealogy analysis, haplotype distribution patterns, and the principal coordinate analysis (PCoA) consistently suggested the existence of three haplotype groups distributed in distinct geographical locations. The genealogical breaks observed and further analysis of geographic/genetic barriers indicated that both land barriers and oceanic currents may have played important roles in the divergence and demography of E. agallocha.
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Acknowledgements
This study is supported by grants from the National Natural Science Foundation of China (Grant No.41776166 and 31700178), the Natural Science Foundation of Guangdong Province (Grant No. 2015A030313136 and 2017A030313159), National Key Research and Development Program of China (Grant No. 2017FY100705), Science and Technology Program of Guangzhou (Grant No. 201707020035), and Chang Hungta Science Foundation of Sun Yat-sen University. The authors wish to thank Dr. Sirajul Haque, Dr. Kalimuddin Bhuiyan, and Dr. Mosharraf Hossen (Institute of Forestry and Environmental Sciences, Chittagong University, Chittagong, Bangladesh); Dr. Sonjai Havanond (Department of National Parks, Wildlife and Plant Conservation, Bangkok, Thailand); Mr. Chanop Jaengjai (Department of Marine and Coastal Resources, Phetchaburi, Thailand); Ms. Jayasri Lakshminarayanan and Mr. Koh Kwan Siong (National Biodiversity Centre, Singapore); Dr. Yubin Yan (the University of Hong Kong, Hong Kong, China); and Dr. Xinnian Li, Dr. Ying Liu, Dr. Suhua Shi, and Dr. Zihong Zhang (Sun Yat-sen University, China) for their assistance in collecting and providing plant material.
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Guo, W., Ng, W.L., Wu, H. et al. Chloroplast phylogeography of a widely distributed mangrove species, Excoecaria agallocha, in the Indo-West Pacific region. Hydrobiologia 807, 333–347 (2018). https://doi.org/10.1007/s10750-017-3409-7
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DOI: https://doi.org/10.1007/s10750-017-3409-7